My proposed experiments:

--A Kamiokande-type proton decay sensor that can use seawater instead of ultrapure water. The idea is that maybe they could put one of these things on the seafloor, and thus have an unlimited supply of water to sift through. Don't know enough about particle physics to know if it's workable, though.

--A cheap solar sail. 'Nuff said.

--An amateur space telescope. There was serious talk about putting one of these at the ISS before the Columbia disaster, and making it free for people to use. Those plans seem dead in the water, but I still think it's a great idea, and would go far in promoting public interest in space.

__________________
"Call me old-fashioned, but I think fire is magic. And it scares me a lot."

--The State